<style>div { position:absolute; width:200px; height:200px; }</style>
<div style="background: -moz-radial-gradient(40px 80px, circle farthest-corner, white, black); top:10px; left:10px;"></div>
<div style="background: -moz-radial-gradient(160px 80px, circle farthest-corner, white, black); top:10px; left:220px;"></div>
<div style="background: -moz-radial-gradient(80px 40px, circle farthest-corner, white, black); top:220px; left:10px;"></div>
<div style="background: -moz-radial-gradient(80px 160px, circle farthest-corner, white, black); top:220px; left:220px;"></div>
<div style="background: -moz-radial-gradient(60px 80px, ellipse farthest-corner, white, black 140px); top:430px; left:10px;"></div>
<div style="background: -moz-radial-gradient(140px 80px, ellipse farthest-corner, white, black 140px); top:430px; left:220px;"></div>
<div style="background: -moz-radial-gradient(80px 60px, farthest-corner, white, black 120px); top:640px; left:10px;"></div>
<div style="background: -moz-radial-gradient(80px 140px, farthest-corner, white, black 120px); top:640px; left:220px;"></div>
